Thermalright 140 X-Silent vs GELID Silent 14 PWM

What the title says. The Thermalright is an older model (not that there has been massive innovation in fans in the last... century), a bit cheaper and is reviewed as giving good pressure and flow at low noise levels. The Gelid is more of an unknown. I haven't had much to do with the brand, but I don't want to be prejudiced. It's newer, PWM-enabled, which is nice, and has few reviews.